PURPOSE: To obtain a color filter having a small depolarizing effect so that when this filter assembled in a liquid crystal display cell, such a product having high contrast and good display performance can be obtd. by using a coloring agent comprising an org. pigment and specifying the proportion of components except for the extender in the org. pigment.
CONSTITUTION: The coloring agent consists of an org. pigment in which the proportion of components except for the extender is ≥95wt.%. It is preferable that the proportion is ≥97wt.%, and more preferably, ≥99wt.%. The extender is a transparent or white pigment to be added to thin the color of the org. pigment and to control its color tone. For example, barium sulfate, heavy magnesium carbonate, soft magnesium carbonate, calcium carbonate, aluminum oxide, kaolinite, halloysite, muscovite, and talc are used. To obtain a color filter having a small depolarization effect, it is preferable to select such a pigment having ≤5wt.% content of the extender. However, when the pigment contains ≥5wt.% extender, the extender can be removed in the production process of a paste, such as dispersing or filtering.
SUZUKI SATORU
IDO HIDEO
